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(a) The content of nine types of volatile compounds present in ZZDJ. Score (b) and loading (c) plots of the two components (PC1 vs. PC2) after principal component analysis (PCA) based on the relative abundance of the volatile compounds in 0–3 year ZZDJ samples. The different types of volatile compounds are designated by the letters A–I, and the abbreviation of each compound is given in Table S1.
